Under Armour UA Performance Tech 3-Pack Low Cut Socks Unisex. These socks keep your feet cool and provide arch support, built for athletes. They feature durable material that wicks sweat & dries fast. The Locked-In Fit design keeps the sock securely on the heel for an adjustment-free fit. Medium cushioning throughout the foot offers comfort & protection, with mesh panels on top of the foot for added breathability. Built-in arch support helps reduce foot fatigue.